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Published on: December 29, 2016
Biphenolate phosphine complexes of tantalum
Lan-Chang Liang1, Liang-Chien Cheng, Tzung-Ling Tsai
1Department of Chemistry and Center for Nanoscience & Nanotechnology, National Sun Yat-sen University, Kaohsiung 80424, Taiwan. lcliang@mail.nsysu.edu.tw
Inorganic Chemistry
|May 29, 2010
Summary
New tantalum complexes featuring the [OPO](2-) ligand were synthesized and characterized. Structural studies revealed a unique hydride complex, [OPO](2)TaH, differing significantly from other tantalum complexes in the series.
Area of Science:
- Organometallic Chemistry
- Coordination Chemistry
- Tantalum Complexes
Background:
- The development of novel organometallic complexes is crucial for catalysis and materials science.
- Tantalum complexes are of interest due to their unique electronic properties and reactivity.
- Ligand design plays a key role in stabilizing and tuning the properties of metal complexes.
Purpose of the Study:
- To synthesize and structurally characterize tantalum complexes supported by the 2,2'-phenylphosphino-bis(4,6-di-tert-butylphenolate) ([OPO](2-)) ligand.
- To investigate the reactivity of these tantalum complexes towards alkylation, thermolysis, and hydrolysis.
- To elucidate the structural differences between various tantalum complexes within the [OPO](2-) supported series.
Main Methods:
- Synthesis of tantalum complexes via reactions with Li(2)[OPO] and TaCl(5).
- Characterization using multinuclear NMR spectroscopy for solution structures.
- Determination of solid-state structures via X-ray crystallography.
- Computational analysis using Density Functional Theory (DFT).
Main Results:
- High-yield synthesis of [OPO](2)TaCl, [OPO](2)TaR (R = Me, Et), [OPO](2)TaH, and [OPO](2)TaOH.
- Spectroscopic and crystallographic data confirmed 7-coordinate tantalum complexes with phosphorus donor coordination.
- The hydride complex, [OPO](2)TaH, exhibited a distinct structure compared to other tantalum complexes ([OPO](2)TaX, X = Cl, OH, Me, Et).
- DFT calculations indicated the observed hydride structure is energetically favored.
Conclusions:
- The [OPO](2-) ligand effectively supports a variety of tantalum complexes.
- Significant structural diversity exists within this series, particularly for the tantalum hydride complex.
- The findings provide insights into tantalum coordination chemistry and ligand effects on complex structure.
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